vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
Count: -
   euphyllophytes see Clade Euphyllophyta Lecointre & Le Guyader 2006 [Cantino & Donoghue 2020]
  Count: -
     monilophytes - ferns see Clade Monilophyta Cantino & Donoghue 2007 [Doyle, Cantino & Donoghue 2020]
    Count: -
       Class Psilotopsida D.H.Scott (1909) see Subclass Ophioglossidae Klinge (1882)
      Count: [g] 2o;2f;6g
         1 Order Ophioglossales Link (1833)
        Count: [g] 1f;4g
         2 Order Psilotales Prantl (1884)
        Count: [g] 1f;2g